swiss-transport-mcp: Instructions file for Claude Code

CLAUDE.md

swiss-transport-mcp CLAUDE.md is an instructions file for Claude Code from malkreide/swiss-transport-mcp. It costs 5,556 tokens per session, scanned A, a copy of swisstopo-mcp CLAUDE.md, MIT.

Project instructions for a Model Context Protocol server that provides Swiss public-transport information, along with shared portfolio rules and testing guidance.

In plain words
What is it for?
Use them when updating the Swiss transport server, refreshing its code, running tests, or diagnosing failed checks.
Why use it?
They help an agent avoid working from an outdated copy, using the wrong default branch, or running checks with versions that differ from continuous integration.

Instructions file for Claude Code

Written for Claude Code: the file is CLAUDE.md. Also seen: mentions CLAUDE.md; mentions Codex.

This is malkreide/swiss-transport-mcp's own configuration. It tells Claude Code how to work on swiss-transport-mcp itself, so it is not a mod to install elsewhere. Copy it as a starting point and replace the rules that are about this project. Everything swiss-transport-mcp configures →

Reuse

Borrowing it

Nothing to install: this file belongs to malkreide/swiss-transport-mcp. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.

Copy the file
curl -O https://raw.githubusercontent.com/malkreide/swiss-transport-mcp/main/CLAUDE.md
Clone the repo
git clone --depth 1 https://github.com/malkreide/swiss-transport-mcp

Made for: Claude Code.

Wrote this? Show the measurements

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README.md
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Per session 5,556 This file is loaded in full into every session.
When invoked 5,556 The same file — it is already loaded in full.
Security scan A 1 finding. A grade says what 26 rules found in the file — not that it is safe.
Origin 81% copy Near-identical to another mod in the catalogue.
Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

ModelPer sessionOnce invoked
Fable 5.1 $0.05556 $0.05556
Opus 5.5 $0.02222 $0.02222
Sonnet 5.5 $0.01111 $0.01111
Haiku 4.5 $0.00556 $0.00556

Measured 12d ago against content hash 4196b13bf29a, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

swiss-transport-mcp CLAUDE.md scanned grade A with 1 finding against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 12d ago.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Makes network callslowCapability

Not a fault in itself. Listed so you know the mod talks to something, and to what.

Token aus der Umgebung in einen curl-Header zu setzen, blockiert der
Origin

This is a copy

81% identical to swisstopo-mcp CLAUDE.md — 186 lines differ, which has more behind it and is treated as the original. This page carries a canonical link to it rather than competing with it.

CLAUDE.md · 409 lines

How it starts

The opening of the file, as written. The whole thing — 409 lines — stays where its author put it; the contents beside it link to each section on GitHub.

CLAUDE.md

Teil 1 — Portfolio-Konventionen

Vor der Arbeit

Klon-Aktualität prüfen — Standard-Branch ermitteln, nicht main annehmen:

B=$(git ls-remote --symref origin HEAD | sed -n 's|^ref: refs/heads/\([^[:space:]]*\).*|\1|p')
git fetch origin "${B:?Standard-Branch nicht ermittelbar}" &&
  git rev-list --count HEAD..FETCH_HEAD

Drei Server im Portfolio heissen ihren Standard-Branch master (openlex-mcp, swiss-courts-mcp, swisstopo-mcp); dort scheitert ein fest verdrahtetes origin/main mit «couldn't find remote ref main». Wer das für ein Netzproblem hält, arbeitet weiter auf genau dem veralteten Klon, vor dem dieser Absatz warnt. Den :?-Schutz nicht weglassen: Bei leerem B fetcht git still den Remote-HEAD und endet mit 0.

Ein veralteter Klon erzeugt eine rote CI, deren Ursache nicht im Diff steht. Am 3.8.2026 zweimal passiert — beide Male fehlten genau die Commits, die das Gate einführten, an dem der Branch scheiterte.

Gates lokal fahren, mit der GEPINNTEN ruff-Version aus der CI. Eine andere Version meldet Abweichungen, die niemand verursacht hat.

Tests

Gegenprobe ist Pflicht. Ein Test, der grün bleibt, wenn man die Implementierung entfernt, prüft nichts. Jede neue Zusicherung einzeln neutralisieren und zeigen, dass genau die zugehörigen Tests fallen.

Zwei Fallen, die beide grün blieben:

  • Eine Fake-Uhr, die nur beim Schlafen vorrückt, kann eine Zusicherung über echte Zeit nicht widerlegen.
  • monkeypatch.setattr(modul.asyncio, "sleep", ...) greift ins Modul asyncio selbst und entschärft die Mechanik im ganzen Prozess. Patche einen Modul-Alias (_sleep = asyncio.sleep), nicht das fremde Modul.

Handgeschriebene Fixtures kodieren die Annahme des Autors und können sie nicht widerlegen. Mindestens eine aufgezeichnete Antwort pro externem Endpunkt, mit Aufnahmedatum.

Wenn etwas rot ist

Roter Live-Test: erst die Quelle abfragen, dann einordnen. Nicht aus der Fehlermeldung schliessen. Am 3.8.2026 hiess "nicht gefunden" nicht, dass der Datensatz weg war, sondern dass die Quelle die Schreibweise ihrer Kopfzeile gewechselt hatte — vier von sechs Datensätzen produktiv kaputt, alle Unit-Tests grün.

Read the full file on GitHub · 409 lines

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

  1. 12d ago Changed · +28 lines · +445 tokens per session 4196b13bf29a
  2. 1mo ago Changed · +4 lines · +108 tokens per session bbec1f4335c8
  3. 1mo ago Changed · +55 lines · +809 tokens per session 20a4c89f1a7b
  4. 1mo ago Changed · +50 lines · +672 tokens per session 53e700000478
  5. 1mo ago Changed · -141 lines · -2,000 tokens per session 93110cf4b4cd
  6. 1mo ago First seen · 413 lines · 5,522 tokens per session scan A 278a147a7f75

Subscribe to this mod's changes

swiss-transport-mcp CLAUDE.md is an instructions file published in the GitHub repository malkreide/swiss-transport-mcp (8 stars, last pushed 13d ago), licensed MIT. It adds 5,556 tokens to every session, about $0.0222 per session on Opus 5.5. A static security scan graded it A with 1 finding (makes network calls). It is 81% identical to swisstopo-mcp CLAUDE.md, differing in 186 lines, and is treated as a copy.

Related

Other instructions, from other repositories